3=10-2r

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Solution for 3=10-2r equation: 



3=10-2r

We move all terms to the left:

3-(10-2r)=0

We add all the numbers together, and all the variables

-(-2r+10)+3=0

We get rid of parentheses

2r-10+3=0

We add all the numbers together, and all the variables

2r-7=0

We move all terms containing r to the left, all other terms to the right

2r=7

r=7/2

r=3+1/2

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